<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta name="Keywords" content="danmu">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>弹幕网站</title>
    <style type="text/css">
        body {
            font-size: 12px;
            font-family: "微软雅黑";
        }
        * {
            margin: 0;
            padding: 0;
        }
        .screen {
            width: 300px;
            height: 100px;
            background: #669900;
        }
        .dm {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
        }
        .dm .d_screen{
            width: 38px;
            height: 38px;
            background: #600;
            display: block;
            text-align: center;
            line-height: 38px;
            text-decoration: none;
            font-size: 20px;
            color: #fff;
            border-radius: 19px;
            border: 1px solid #fff;
            z-index: 2;
            position: absolute;
            right: 20px;
            top: 20px;
            outline: none;
        }
        .dm .d_screen {
            width: 100%;
            height: 100%;
            background: #000;
            position: absolute;
            top: 0;
            left: 0;
            opacity: 0.6;
            filter: alpha(opacity = 60);
            z-index: 1;
        }
        .dm .d_screen .d_show {
            position: relative;
            z-index: 2;
        }
        .dm .d_screen .d_show div {
            font-size: 26px;
            line-height: 36px;
            font-weight: 500;
            position: absolute;
            top: 76px;
            left: 10px;
            color: #fff;
        }
        .send {
            width: 100%;
            height: 76px;
            position: absolute;
            bottom: 0;
            left: 0;
            border: 1px solid red;
        }
        .send .s_filter {
            width: 100%;
            height: 76px;
            background: #000;
            position: absolute;
            bottom: 0;
            left: 0;
            opacity: 0.6;
            filter: alpha(opacity = 60);
        }
        .send  .s_con {
            width: 100%;
            height: 76px;
            position: absolute;
            top: 0;
            left: 0;
            z-index: 2;
            text-align: center;
            line-height: 76px;
        }
        .send .s_con .s_text {
            width: 800px;
            height: 36px;
            border: 0;
            border-radius: 6px 0 0 6px;
            outline: none;
        }
        .send .s_con .s_submit {
            width: 100px;
            height: 36px;
            border-radius: 0 6px 6px 0;
            outline: none;
            font-size: 14px;
            color: #fff;
            background: #65c33d;
            font-family: "微软雅黑";
            cursor: pointer;
            border: 1px solid #5bba32;
        }
        .send .s_con .s_submit:hover {
            background: #3eaf0e;
        }
    </style>
</head>
<body>
<!-- dm start -->
<div class="dm">
    <!-- d_screen start -->
    <div class="d_screen">
        <div class="d_show">
        </div>
    </div>
    <!-- end d_screen -->
    <!-- send start -->
    <div class="send">
        <div class="s_filter"></div>
        <div class="s_con">
            <input type="text" class="s_text" />
            <input type="button" value="发表评论" class="s_submit" id="btn"/>
        </div>
    </div>
    <!-- end send -->
</div>
<!-- end dm-->
<script src="jquery-1.11.0.min.js"></script>

<script type="text/javascript">
    $(function() {
        $("#btn").click(function(){
            send();
        });
        //回车键按下时，输出到弹幕
        $(".s_text").keydown(function() {
            var code = window.event.keyCode;
            if (code == 13)
            {
                send();
            }
        });
    });

    var websocket=null;
    var _top=80;
    var index=0;
    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
        websocket=new WebSocket("ws://localhost:8888/ws");
    }else{
        alert("Not Support WebSocket!");
    }
    // //连接发生错误的回调方法
    // websocket.onerror = function(){
    //     setMessageInnerHTML("error");
    // };
    // //连接成功建立的回调方法
    // websocket.onopen = function(event){
    //     setMessageInnerHTML("open");
    // }
    //接收到消息的回调方法
    websocket.onmessage = function(){
        setMessageInnerHTML(event.data);
    }
    // //连接关闭的回调方法
    // websocket.onclose = function(){
    //     setMessageInnerHTML("close");
    // }
    // //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    // window.onbeforeunload = function(){
    //     websocket.close();
    // }
    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        //追加弹幕消息到div中
        $(".d_show").append("<div id='"+index+"'>"+ innerHTML + "</div>");
        //移动弹幕div
        launch();
    }
    //发送消息给后台服务器
    function send(){
        var message = $(".s_text").val();
        $(".s_text").val("");
        websocket.send(message);
    }
    //移动弹幕
    function launch(){
        //获得屏幕高度
        var _height = $(window).height();
        //获得横坐标 屏幕右边
        var _left = $(window).width() - $("#"+index).width();
        //移动速度 奇偶数不一样
        var time=10000;
        if(index%2==0)
            time=20000;
        //纵坐标 每个弹幕向下移动
        _top += 80;
        if(_top>_height-100)
            _top=80;
        //给div定位
        $("#"+index).css({
            left:_left,
            top:_top,
            color:getRandomColor()
        });
        //启动移动动画
        $("#"+index).animate({
                left:"-"+_left+"px"},
            time,
            function(){});
        //div的id加一
        index++;
    }
    //随机获取颜色值
    function getRandomColor() {
        return '#' + (function(h) {
            return new Array(7 - h.length).join("0") + h
        })((Math.random() * 0x1000000 << 0).toString(16))
    }
</script>
</body>
</html>